Move over Kim—This time, it's Kourtney Kardashian's butt that has hooked our consciousness. She has been on a sexy body photo spree, especially while the sisters and their friends enjoy a holiday in the sunshine.

The ageless mum-of-three, who recently celebrated her 38th birthday, has posted yet another sizzling shot of her remarkable butt.

The reality star looked smoking hot in her bikini as she posed by the pool. shamelessly flashing her bum to camera.

Kneeling down by the pool, Kourtney's booty can be seen in all its curvaceous glory.

Writing alongside the snap, she told her 56.5 million Instagram followers: "This is how we do it down in Puerto Rico"

The star's close friend Joyce Bonelli wished her a Happy Birthday by calling her the best birthday suit she has ever seen.

We are inclined to agree. This Kardashian is really turning into a smouldering beauty.